Finding the Third Proportional to 142,699 and 209,910

Step by Step Solution

1. Step 1: Write the proportion equation
   142,699 : 209,910 = 209,910 : x
2. Step 2: Convert to fraction form
   142,699/209,910 = 209,910/x
3. Step 3: Cross multiply
   142,699x = 209,910 × 209,910
4. Step 4: Simplify right side
   142,699x = 44,062,208,100
5. Step 5: Solve for x
   x = 44,062,208,100/142,699
6. Step 6: Final answer
   x = 308,777.27